The heights of a random sample of 50 senior high school students showed a mean of 174.5 centimeters. It is known that the standard deviation of all senior high school students is 6.9 centimeters. Is there reason to believe that there has been a change in the average height of 175 cm? Use 0.05 level of significance.

What is the computed test statistics? " Your answer Formulate null and alternative hypotheses. (Write it in mathematical symbols, t.e., u = 1, u > 1) " Your answer What is your conclusion? * Your answer What is your decision? (Reject Ho or Do not reject Ho) * Your answer What is the appropriate test statistics? (2 - test or T - Test) " Your